47results about How to "Accurate gain" patented technology

The present invention provides an apparatus and method of multiple antenna receiver combining of high data rate wideband packetized wireless communication signals, where the apparatus includes M receive antennas, receiving M high data rate wideband packetized wireless communication signals, where each of the signals includes N frequency bins. The apparatus, in an exemplary embodiment, includes (1) a joint timing recovery units that perform joint coarse signal timing estimation, joint frequency offset estimation, and joint fine timing estimation on each of the signals, (2) M Fast Fourier Transform units (FFTs) that each convert the digital data for each of the M signals into frequency domain information for each of the N received frequencies and that output Q pilots for each of the signals, where Q is a positive integer, and (3) a combiner that weights and combines the outputs of the M FFTs for each of the N received frequencies.

In a sensor fusion apparatus and method for optical and magnetic motion capture systems and a record medium capable of being read through a computer having a writing of a program to realize the inventive method, in which a shortcoming of respective systems can be overcome and merits can be led by simultaneously using the optical motion capture system (OMCS) and the magnetic motion capture system (MMCS) to obtain motion capture data more precisely, the method includes a first step of obtaining an optical marker signal and a magnetic sensor signal for the motion capture object; a second step of converting the magnetic sensor signal into a corresponding optical marker signal, and acquiring a virtual optical marker signal; a third step of modeling a relation between the virtual optical marker signal and the optical marker signal to a dynamic model through a system identification; and a fourth step of using the optical marker signal as it is, when the optical marker signal is normal, and using a signal gained by inputting the virtual optical signal into the dynamic model, as a usage for a correction of the optical marker signal, by using the dynamic model when the optical marker signals are discontinuous, according to a normal or abnormal state of the optical marker signal.

Actual ultrasound attenuation in tissue is used to calculate gain compensation profiles which are used to create a uniform image. Axial, lateral, elevation gain profiles are used to correct the attenuation and ultrasound variation in each direction. In addition, automatic activation of the automatic gain compensation is described.

Disclosed herein are embodiments of an auto ranging system and method for an analog signal. A microprocessor is configured to digitally control the programmable gains of an operational amplifier based on the digital output of an A/D converter which may reside on or packaged along with the microprocessor. The amplifier receives a raw analog signal from a sensor and provides an amplified analog signal to the A/D converter. The gain of the amplifier generally corresponds to some range of the sensor signal. The A/D converter outputs a number of bits representative of the input signal. A microprocessor which is configured to digitally control the programmable gains of the amplifier receives and examines the output from the A/D converter and automatically adjusts the gain of the amplifier accordingly and as needed to keep or maintain the output from the A/D converter in a predetermined range.

This invention is about a readout apparatus and method for time-of-flight and energy measurements with silicon photomultipliers (SIPM) coupled to a scintillator. The timing measurement can be as accurate as 50 ps or below, after calibration. The energy is measured using a time-over-threshold technique, and the energy resolution is only constrained by the scintillation statistics. In order to achieve low power of 10 mW per channel, a low impedance input amplifier and analogue time-to-digital converters (TDCs) based on time interpolation are used. The readout circuit can be triggered by a single photoelectron (p.c.) with a signal-to-noise ratio (SNR) above 20 dB. The said readout circuit operates with SiPMs of different gain, polarity and matrix size. The preferred embodiment of the readout apparatus is a multi-channel application specific integrated circuit (ASIC) with 64 channels.

A level detector includes a comparing circuit and an integrating circuit. The comparing circuit generates pulses each having its width corresponding to the length of a time period during which the strength of an input signal is higher than a reference value. Alternatively, the comparing circuit may generate pulses each having its width corresponding to the length of a time period during which the strength of the input signal is lower than the reference value. The comparing circuit successively outputs the pulses. The integrating circuit outputs a signal having its strength corresponding to an integration value obtained by temporally integrating the signal from the comparing circuit.

The present invention relates to a mass flow controller for a control purge and a managing method of the same. When a user sets the mode to a control purge mode capable of controlling a maximum flowing amount for constantly maintaining a maximum flowing amount when performing a purge function after the user sets a purge function mode based on a purpose of use of a mass flow controller, a control circuit compares a set value of a flowing amount inputted based on a user's selection with a previously set threshold value and controls a valve for constantly maintaining a maximum flowing amount by switching to a gain resistor for a purge mode having a gain value capable of performing a purge function and controls a valve for thereby accurately controlling a small flowing amount by switching to a gain resistor for a common control mode having a gain value capable of performing a common control function. When a user sets the mode to a purge function mode based on a state of use of a mass flow controller, fully opens a valve and sets a valve open purge mode for obtaining a maximum flowing amount, a control circuit compares a set value of a flowing amount inputted by a user with a previously set threshold value and controls a valve for fully opening a valve for thereby implementing a maximum flowing amount and accurately controlling a small flowing amount.

Present invention relates to a fast automatic gain control method for receiving data short distance wireless networks, belonging to wireless communication technology field. It contains first receiving radio-frequency signal sent from short distance wireless networks in a time section, after frequency conversion processing to obtain a group of baseband receive digit signal, amplifying amplitude of a group of baseband receive digit signal according to current gain value. Proceeding statistics sampling point number whose signal amplitude is greater than target amplitude value in baseband receive digit signal, comparing said sampling point number with an ideal number range, circulation large or small amplitude adjusting gain value to continuously several time section signal, to make receiving signal amplitude approaching to A/D convertor full scale at automatic gain control ending. Said method reduces adjusting time and ensures accuracy of alignment.

A circuit for performing arithmetic operations includes a differential capacitive transimpedance amplifier (CTIA) and a cross-multiplexer. The cross multiplexer forwards the current to be integrated out of a plurality of current sources either to the positive input port of the differential CTIA for positive integration in direct mode or to the negative input port of the differential CTIA for negative integration in reverse mode.

The present invention provides a ΔΣ modulator of a frequency modulation system that can lessen the requirement of linearity for an oscillator.

A ΔΣ modulator comprises an oscillating apparatus that changes a frequency thereof according to an input signal, a quantizing means for quantizing a frequency modulation signal output from the oscillating apparatus, and an operation means for applying an operation to a digital signal output from the quantizing means. The oscillating apparatus comprises an oscillator that changes a frequency thereof according to the input signal, a reference signal source that outputs a reference signal at a predetermined frequency, a mixer that receives the signals from the oscillator and the reference signal source, and a low-pass filter that passes a low frequency component of a signal output from the mixer. The center oscillation frequency of the oscillator is set higher than a target center oscillation frequency of the frequency modulation signal.

The invention discloses a multi-channel signal amplifying circuit of a low-duty ratio narrow pulse signal and a control method. The multi-channel signal amplifying circuit of the low-duty ratio narrow pulse signal comprises a variable gain amplifying circuit, an adder circuit, a sampling keeping circuit and a master control unit module, wherein the master control unit module comprises a micro-control module; and an analogue-digital conversion module, a trigger circuit and a digital-analogue conversion module are integrated inside the micro-control module. According to the control method of the multi-channel signal amplifying circuit based on the low-duty ratio narrow pulse signal, the adder circuit can merge a plurality of paths of output signal amplitudes of the variable gain amplifying circuit into a path of signal; the micro-control module in the master control unit module judges the signal amplitude output by the adder circuit, and adjusts the voltage change output by the digital-analogue conversion module, so that the gain of a voltage-programmed variable gain amplifier is correspondingly changed, and the adder circuit outputs the pulse signal amplitude to stabilize at a set numerical value, so that a dynamic range output by the variable gain amplifier is reduced.

The acoustic properties of so-called instant fit ear tips, which in contrast to otoplastics are not produced individually, should be able to be better taken into consideration when adjusting a hearing aid for an individual wearer. To this end a method is proposed in which an OLG measurement, in other words an open loop gain measurement, is performed on the hearing aid when it is being worn. The OLG measurement curve obtained is compared with an OLG reference curve. A value is ascertained from the comparison which represents the level of closure of the hearing aid or of its otoplastic in the ear of the wearer. On the basis of this value the gain of the hearing aid is finally corrected. Furthermore, a corresponding adjustment device is provided. It is thus possible in a simple manner to take into consideration the individual, current level of closure during the adjustment.

The invention provides a power supply system used for a silicon photomultiplier of a PET system. The power supply system comprises a data processing module, a temperature monitoring module, an operation module and a voltage supply chip. The system is used for providing stable and efficient voltage for the silicon photomultiplier.

The invention relates to a howling suppression method and device, computer equipment and a storage medium. The method comprises the following steps: acquiring a current audio signal corresponding to a current time period, and performing frequency domain transformation on the current audio signal to obtain a frequency domain audio signal; dividing the frequency domain audio signal to obtain sub-bands, and determining a target sub-band from the sub-bands; obtaining a current howling detection result and a current voice detection result corresponding to the current audio signal, and determining a sub-band gain coefficient corresponding to the current audio signal based on the current howling detection result and the current voice detection result; obtaining a historical sub-band gain corresponding to the audio signal in the historical time period, and calculating a current sub-band gain corresponding to the current audio signal based on the sub-band gain coefficient and the historical sub-band gain; and performing howling suppression on the target sub-band based on the current sub-band gain to obtain a first target audio signal corresponding to the current time period. By adopting the method, the howling suppression accuracy is improved.